refactor: Restructure source code folder

This way the location of certain classes should make more sense

src/authorization/access/AgentAccessChecker.ts

@@ -0,0 +1,15 @@
+import { ACL } from '../../util/Vocabularies';
+import type { AccessCheckerArgs } from './AccessChecker';
+import { AccessChecker } from './AccessChecker';
+
+/**
+ * Checks if the given WebID has been given access.
+ */
+export class AgentAccessChecker extends AccessChecker {
+  public async handle({ acl, rule, credential }: AccessCheckerArgs): Promise<boolean> {
+    if (typeof credential.webId === 'string') {
+      return acl.countQuads(rule, ACL.terms.agent, credential.webId, null) !== 0;
+    }
+    return false;
+  }
+}